About IGS

Our mission is to make gemology accessible and affordable

Established in 1998, IGS is the largest online gemology resource and community.

Who are IGS members?

A society is about people that are interconnected. Here at IGS, our passion for gemstones brings us together. IGS has members on every continent (except Antarctica) who range from seasoned professionals to the merely curious.

Aspiring Professionals

Accelerate your path towards a professional gemology career

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Curious Enthusiasts

Learn key knowledge and skills to further pursue your passion

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Lapidaries & Metalsmiths

Deepen your skillset for working with gemstones in jewelry

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Collectors & Private Dealers

Price and quality guidance on over 70 types of gemstones

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What people are saying

  • " Becoming a Pro Member of IGS just made good sense for my business. The gemology resources are fantastic, and my profile lets potential customers know I am serious about colored gemstones. And frankly, if I get any exposure to potential customers it's a no-brainer. "
    Paul BierkerJeweler, IGS Pro Member

    The IGS Team

    The management and advisory team at IGS is a diverse group of professionals committed to delivering our mission.

    Seth and Lisa Rosen

    Seth and Lisa Rosen

    Company Management

    In 2012, Donald Clark retired and passed along stewardship of the IGS to Seth and Lisa Rosen.  Seth and Lisa were longtime members of the IGS.  Seth is a gem collector and active Internet entrepreneur, who had already spent a great deal of time in the custom jewelry business. He...
    Meet Seth and Lisa Rosen
    Donald Clark, CSM

    Donald Clark, CSM IMG

    Founder

    Donald Clark, CSM, founded the International Gem Society in 1998. Donald started in the gem and jewelry industry in 1976. He received his formal gemology training from the Gemological Institute of America (GIA) and the American Society of Gemcutters (ASG). The letters "CSM" after his name stood for Certified Supreme...
    Meet Donald Clark, CSM IMG

    Jeffery Bergman, SSEF SGC

    Technical Advisor

    Jeffery Bergman, SSEF SGC, founder and director of 8th Dimension Gems in Thailand, is an American gem dealer with more than 40 years of experience in gemstone and fine jewelry mining, cutting, wholesaling and retailing. His career has taken him to more than 50 countries and every continent except Antarctica....
    Meet Jeffery Bergman, SSEF SGC

    Joel E. Arem, Ph.D., FGA

    Position

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    Meet Joel E. Arem, Ph.D., FGA

    Fatma Oya Borahan, GG, FGG

    Meet Fatma Oya Borahan, GG, FGG

    Barbara Smigel, PhD. GG

    Meet Barbara Smigel, PhD. GG

    Addison Rice

    Meet Addison Rice

    Dr. Gerald Wykoff GG CSM

    Meet Dr. Gerald Wykoff GG CSM

    Jeff R. Graham

    Meet Jeff R. Graham

    Phoebe Shang, GG

    Meet Phoebe Shang, GG

    Kyrylo Gubariev, Graduate Gemologist (GG, AJP)

    Meet Kyrylo Gubariev, Graduate Gemologist (GG, AJP)

    Never Stop Learning

    When you join the IGS community, you get trusted diamond & gemstone information when you need it.

    Become a Member

    Get Gemology Insights

    Get started with the International Gem Society’s free guide to gemstone identification. Join our weekly newsletter & get a free copy of the Gem ID Checklist!